HI, I’m having the same issue… Blog option not showing in customize settings.
I am running all latest versions
Wordpress 4.6.1
Generate Press 1.3.39 with GP child theme activated
GP Premium 1.2.89
I reinstalled GP Premium and deactivated ALL other plugins (only having GP Premium activated) and just to be sure I also deactived all GP Premium plugins except for Generate Blog
Still nothing is showing in the customize settings… Please help!